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Heat issue grandprix 2008 3.8

When I run water In both directions I assume I want to leave the water in there as I do not want to get air in the hose
 


id just flush one hose till coolant or water comes out the other, then put the hoses back on as full of water as you can. why put a hose back on thats full of air already right?
 


you can also touch both heater core hoses after its warmed up good. if both are hot you fixed it.

if one is hot, one cold, its not pumping still for some reason.

these hoses can get damn hot, dont get burned. do the quick touch test first.
 
car has to get up in temps for then to get real hot like they should be.

what temp t stat you running? being up north there you should be running a 195.
 
your temp gauge on the dash should tell you. when its like 2 or 3 lines from red thats your normal area on most gp's, in america, i dont do metric well lol

my regal needle is one line under the 1/2 way mark, thats about 200 degrees.
 


if you have a torque app it will tell you the temp as well in digital read out, so you know exactly whats its reading vs lines on a gauge in the dash.


like so, this was a real hot day parked with the a/c on full blast. love that 158 intake temp lol

tapp_zpsb02c1a42.jpg
 
Gotcha, what temperature is the air coming out of the vents? I just checked mine at 90F on a 22F degree day, after sitting for a half hour cooling down and then starting back up for about 5 minutes, this is with fan on about halfway, temp all the way up, recirc on and the position was full on vents.
 


if a shop changed it see if it says what temp they used on the receipt. if its a 180 that can keep your temps pretty low in winter time.

195 is stock. i dont think anyone sells a 212 lol a 195 lets the engine run around 200 to 210 ish, where gm wants its it to run. your hi speed fan setting is 212 too.
 
Really, mine came stock with a 212F one. Well It was built in Canada, so maybe it was a mixup with a cold weather equipped car. Who knows? It currently is running a 195F and couldn't be happier. I get blow dryer type heat in about 10 minutes even at the -0F temperatures Dreary Erie is famous for.
 
Will take a reading on the torque app and I will also check the temperature inside after I drive to work tomorrow, it's a good 25mins drive.
 
I gave it another flush and actual small rocks came out of the hose, I let the car run and the heat seems a lot hotter. Here is the torque app result
629a7e68c0654c8bbb750ca62d291ca6.jpg
 
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